Going from star player to new hire is humbling. Remember what made you a star in the first place: learning fast.

Going from known to unknown strips away the status and leaves the ability underneath, which is disorienting even when nothing has actually been lost. You were not good because of the position. You were good because you picked things up quickly, and that travels.

When the new place makes you feel like a beginner, put your effort into learning speed rather than into looking competent. Ask the basic questions early, while being new still explains them. The reputation rebuilds faster than you think, and on better foundations.